20537664456 has 32 divisors (see below), whose sum is σ = 51602184000. Its totient is φ = 6811485120.

The previous prime is 20537664421. The next prime is 20537664457. The reversal of 20537664456 is 65446673502.

It is a super-2 number, since 2×20537664456² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20537664457) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2145315 + ... + 2154866.

It is an arithmetic number, because the mean of its divisors is an integer number (1612568250).

Almost surely, 2^20537664456 is an apocalyptic number.

It is an amenable number.

20537664456 is an abundant number, since it is smaller than the sum of its proper divisors (31064519544).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20537664456 is a wasteful number, since it uses less digits than its factorization.

20537664456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4300389 (or 4300385 counting only the distinct ones).

The product of its (nonzero) digits is 3628800, while the sum is 48.

The spelling of 20537664456 in words is "twenty billion, five hundred thirty-seven million, six hundred sixty-four thousand, four hundred fifty-six".